Consider positive and negative charges moving horizontally through the four regions in the figure below. Rank the currents in these four regions, from lowest to highest. (Ia is the current in Figure (a), Ib the current in Figure (b), etc.)
4
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Buoyancy: A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3.
A. 2.5 N B. 20 N C. 24 N D. 34 N E. 40 N
A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field. If the proton's speed tripled, its time to go around its circular path would be
A) double. B) one third. C) triple. D) one half. E) the same.
The combining of two nuclei to form a larger nucleus with the release of energy is
a. nuclear fission. b. nuclear fusion. c. neutron activation. d. nuclear emission. e. beta decay.
You have 1 kg of liquid water and 1 kg of steam. If you want to increase the temperature of both of them by 10°C, which would require more added energy?
1.the water 2.the steam 3.They both require the same amount of energy to be warmed 10°C. 4.It cannot be determined because it depends on the actual temperature of the water and steam as well as the pressure.